(AP) — The National Transportation Safety Board says a helicopter that crashed in Hawaiʻi last month and killed all four people on board nose-dived after it unexpectedly stopped making a shallow left turn. A fire then incinerated much of the aircraft. The agency’s preliminary report on the Feb. 22 crash on Kauaʻi said U.S. Navy contractor Croman Corp. was using the Sikorsky S-61N helicopter to retrieve inert training torpedoes from the Pacific Ocean at the time. The crew’s job involved locating a training torpedo in open waters and retrieving it using a recovery basket or cage.

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